PrepTest 121, Section 3, Question 22
The first thing any embryo must do before(467 more words not shown)
The passage provides information to(20 more words not shown)
- ASince humans and(21 more words not shown)
- BFor the elaboration(22 more words not shown)
- CPositional information for(21 more words not shown)
- DA study of(31 more words not shown)
- EWhile the fruit(29 more words not shown)
Reading the passage
What do we know about humans and fruit flies? Their polarity mechanisms differ, but the genes involved in making eyes are similar. My prediction is a relationship that preserves that distinction between early orientation and later formation of parts.
Working the answers
- A
This jumps from embryonic development to behavior. Similar genes involved in making structures don't, on their own, establish that studying fruit fly behavior explains human behavior.
- B
The later development of parts is the area of similarity, not the claimed difference in genetic material. We also receive no comparison of its quantity.
- C
The human polarity mechanism is still a mystery. We can't assign humans the fruit fly's pre-fertilization arrangement when the writer expressly says the process isn't known.
- DCorrect
The similarity in eye-development genes makes the fly's visual-system development a more promising comparison for humans than its different polarity mechanism. This follows the specific similarity and difference the account supplies.
- E
We are told how quickly the fly becomes a larva, but not given this account of human development. In particular, nothing says humans' longer development is caused by a need to establish a nervous system before limbs. That causal explanation cannot be added from outside the text.
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